package com.example.mycalc;

import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;
import android.text.TextUtils;

import java.util.HashMap;

public class CalcProvider extends ContentProvider {

    static final String PROVIDER_NAME = "com.example.provider.CalcResult";
    static final String URL = "content://" + PROVIDER_NAME + "/calcs";
    static final Uri CONTENT_URI = Uri.parse(URL);

    static final String _ID = "_id";
    static final String NAME = "name";
    static final String RESULT = "result";

    private static HashMap<String, String> CALCS_PROJECTION_MAP;

    static final int CALCS = 1;
    static final int CALC_ID = 2;

    static final UriMatcher uriMatcher;
    static{
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(PROVIDER_NAME, "calcs", CALCS);
        uriMatcher.addURI(PROVIDER_NAME, "calcs/#", CALC_ID);
    }
    /**
     * Database specific constant declarations
     */
    private SQLiteDatabase db;
    static final String DATABASE_NAME = "CalcResult";
    static final String CALC_TABLE_NAME = "calcs";
    static final int DATABASE_VERSION = 1;
    static final String CREATE_DB_TABLE =
            " CREATE TABLE " + CALC_TABLE_NAME +
                    " (_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                    " name TEXT NOT NULL, " +
                    " result Double NOT NULL);";

    /**
     * Helper class that actually creates and manages
     * the provider's underlying data repository.
     */
    private static class DatabaseHelper extends SQLiteOpenHelper {
        DatabaseHelper(Context context){
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db)
        {
            db.execSQL(CREATE_DB_TABLE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS " +  CALC_TABLE_NAME);
            onCreate(db);
        }
    }
    public CalcProvider() {
    }
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        int count = 0;

        switch (uriMatcher.match(uri)){
            case CALCS:
                count = db.delete(CALC_TABLE_NAME, selection, selectionArgs);
                break;

            case CALC_ID:
                String id = uri.getPathSegments().get(1);
                count = db.delete( CALC_TABLE_NAME, _ID +  " = " + id +
                        (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""), selectionArgs);
                break;

            default:
                throw new IllegalArgumentException("Unknown URI " + uri);
        }

        getContext().getContentResolver().notifyChange(uri, null);
        return count;
    }

    @Override
    public String getType(Uri uri) {
        switch(uriMatcher.match(uri)){
            case CALCS:
                return "vnd.android.cursor.dir/vnd.example.calcs";
            case CALC_ID:
                return "vnd.android.cursor.item/vnd.example.calcs";
            default:
                throw new IllegalArgumentException("Unsupported URI: "+uri);
        }

    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
      long rowId = db.insert(CALC_TABLE_NAME,"",values);
      if(rowId >0){
          Uri _uri = ContentUris.withAppendedId(CONTENT_URI,rowId);
          getContext().getContentResolver().notifyChange(_uri,null);
          return _uri;
      }
      throw new SQLException("Failed to add a record into "+ uri);

    }

    @Override
    public boolean onCreate() {
        Context context = getContext();
        DatabaseHelper dbHelper = new DatabaseHelper(context);
        db = dbHelper.getWritableDatabase();
        return (db == null) ? false:true;

    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
                        String[] selectionArgs, String sortOrder) {
        SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
        qb.setTables(CALC_TABLE_NAME);
        switch(uriMatcher.match(uri)){
            case CALCS:
                qb.setProjectionMap(CALCS_PROJECTION_MAP);
                break;
            case CALC_ID:
                qb.appendWhere(_ID+"="+uri.getPathSegments().get(1));
                break;
            default:
                throw new IllegalArgumentException("Unknow URI "+uri);
        }
        if (sortOrder == null || sortOrder == ""){
            sortOrder = NAME;
        }
        Cursor c = qb.query(db,projection,selection,selectionArgs,null,null,sortOrder);
        c.setNotificationUri(getContext().getContentResolver(),uri);
        return  c;

    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
                      String[] selectionArgs) {
        // TODO: Implement this to handle requests to update one or more rows.
        throw new UnsupportedOperationException("Not yet implemented");
    }
}
